jsr223断言日志写入

jsr223全局监听器，判断响应断言不满足条件时，写日记到同级jmx同级目录，方便取回日记

一个取样器的全局结果基本是ok的，可以避免持续error，减少磁盘压力

全局时多个取样器可能有1个取样器占满，就不再打印其他日志了，可放在每个取样器的局部变量避免

/**
 * JMeter 错误日志记录 
 */
import org.apache.jmeter.services.FileServer
import java.text.SimpleDateFormat

// --- 1. 配置参数 ---
def MAX_LOG_ENTRIES = 500 // 单次压测最多记录多少条错误日志
def MAX_BODY_LENGTH = 1024  // 响应体记录的最大字符数
def ERROR_SAMPLING_RATE = 1.0// 错误记录采样率 (1.0表示所有错误, 0.1表示只随机记录10%的错误)

// --- 2. 状态校验检查 ---
if (prev == null || prev.isSuccessful()) return

def globalErrorCount = props.get("GLOBAL_ERR_COUNT") ?: 0
if (globalErrorCount >= MAX_LOG_ENTRIES) return

if (Math.random() > ERROR_SAMPLING_RATE) return

// --- 3. 准备数据 
def truncateAndClean = { str, limit ->
    if (!str) return "N/A"
    // 先截，减少正则处理内存压力
    def shortStr = str.length() > limit ? str.substring(0, limit) : str
    // 避免字符串转义报错
    return shortStr.replaceAll(/\s+/, " ").trim() + (str.length() > limit ? " [已截断]" : "")
}

def now = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())
def reqBody = truncateAndClean(prev.getSamplerData(), MAX_BODY_LENGTH)
def respBody = truncateAndClean(prev.getResponseDataAsString(), MAX_BODY_LENGTH)

// --- 4. 构建日志 
def logEntry = [
    "\n[${now}] [#${globalErrorCount + 1}] x ${prev.getSampleLabel()}",
    "URL: ${prev.getUrlAsString()}",
    "Status: ${prev.getResponseCode()}",
    "Request: ${reqBody}",
    "Response: ${respBody}",
    "------------------------------------------------------------"
].join("\n")

// --- 5. 线程安全写入 ---
try {
    def fs = FileServer.getFileServer()
    def baseDir = fs.getBaseDir()
    if (baseDir == null) return // 脚本未保存时跳过

    def logFile = new File(baseDir, "jmeter_errors_protected.log")
    
    synchronized (FileServer.class) {
        def currentCount = props.get("GLOBAL_ERR_COUNT") ?: 0
        if (currentCount < MAX_LOG_ENTRIES) {
            logFile.append(logEntry + "\n", "UTF-8")
            props.put("GLOBAL_ERR_COUNT", currentCount + 1)
        }
    }
} catch (Exception e) {
    log.error("写入错误日志失败: " + e.getMessage())
}